As a skinny arsed old dude, I can't say I have ever found the perfect shorts. No matter what I wear some days I'm getting a bit squeezed by the end of a 25-30 mile ride on mixed road surfaces. The best shorts, such as the long distance version of Assos, or the FR Giordana, have been the closest to letting me ride pain free. In recent years I've taken to adding a thin padded undershort such as the Pearl Izumi version. When I saw the name of these shorts, you can imagine I was game to try them. I think its sufficient to say, they are as good or better than the others mentioned, time will tell.
Fit wise, they tend to run a tad smaller (more compressive?) than the Giordana, and are as tight as I would like to experience in a "L" (I'm 6 foot 165 lbs.), even around my skinny legs, so be advised on that count, if you tend to look like Spartacus.